Where did the Garden of Eden go?

http://heavenawaits.wordpress.com/the-garden-of-eden-and-the-%E2%80%9Cpit%E2%80%9D-%E2%80%93-tioran-land-drift-theory/
Rarely do I post anything from a Christian perspective, but this is quite interesting. Here's a couple snippets:
........."Many Christians have assumed that the entire original garden was located somewhere in the Mesopotamian region (around present day Iraq) where the modern Tigris (Hiddekel) and Euphrates rivers flow. But this is only the eastern side of the garden. If we want to find the rest of Eden, mainly the west side, we do NOT look at where the rivers ended up flowing, or where they ended (current Persian Gulf region). We have to look at where the rivers ORIGINATED. As the rivers flowed out, other areas were certainly included in the general garden area, but the source of the rivers is the point of interest here."....
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........"It would also be logical to assume that the rivers flowed toward the east, since that was the most beautiful, most watered area. This would mean the rivers started in the west, and flowed eastward. On today’s map, we see water flowing from north to south.".....